At this point in time, the engine that has been maintained the best and is in the best condition would be my recommendation. With proper maintenance and care either engine will have lot's of good miles left in it. If not maintained properly, constantly lugged down, left to run low on oil or allowed to overheat, most diesel engines could be a problem. The 555 will get better mileage but not have the power, particularly in mountains that the 6V92 will.
I have seen DD92 series replaced at 100k miles due to overheating (the number one killer of DD92's). I have also seen DD92's that are virtually leak free and going strong at well over 200k miles.
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